Underfeed stoker apparatus



May 31, 1932. G. c. COOK 1,860,354

UNDERFEED STOKER APPARATUS Filed April 1, 1927 3 Sheets-Sheet 5 INVENTORBY I ATTORNEY the fuel bed over'said noses leaving thin clined multipleretort underfeed type suitable Patented May 31, 1932 r i r I g UNITEDSTATES PATENT OFFlC-EI'Y GEORGE c. ooox, or lvlILLING'roN,

unnnsrnnn s'roKER APPARATUS Application filed; lipril 1, 1927. serial No-180,168. I v Y The inventionrelatestounderfeed stokers taillongitudinal section through a pusher v i of the inclined multipleretort type, and plate with rocker arm thereof and link -atmoreparticularly t'o-the fuel bedcontrolling tached thereto. V a meansthereof. In stokers of the aforesaid Fig. 5. is an enlarged elevation ofa p'usher type, there is a tendency when burning'cokmember and portionof the plate towhiclr it 55 i ing coals of lhighcarbon content for asolid is hinged, the full lll'lQfPOSltlOIl indicating its dense massunbroken coke to be formed lowered condition for a predetermined setinthere-torts which mass is practically imting, while. the dottedline'position indicates V penetrable by the air supplied through the therelativeposition ofthev pusherim'ember tuyeres-assoc'iated withthe'retorts. As this at the limit ofits elevated condition. Y to cokemass; is forced out of the retort it tends Referring to the drawings,the invention is i toretain its previous shapeand thus will not shownapplied to a standard t pe furnace cover the nose of the respectiveintermecomprising the front wall 10 an bridge wall diate t-uyeres,causing holes to burn through '11 with ash pit 12, the stoker'beingofthemlanes practically'throughout "the, length of for large installationsin which a "series ofinthebed. This results in lack of uniformity clinedretorts 13 are disposed transversely of in fuel b6d %ndlll0l1S,-l0W;I'-3,t6 of combusthe furnace with. intermediate tuyeres 14. Vtion per square foot ofv'grate surface as well The latter are inconnection with-the wind 29 as a large percentage of excess air;--an dthis .box 15 to which air, which maybe preheated,

is especially marked when: preheated fair is is supplied through an airduct 16; Fueliis utilized in the combustion ofthe, fuel and fed fromhoppers 17 to primary or mainrrains with thin fuel beds l w 18 whicharereoiprocated by suitable mecha- The invention has for its object toobviate ni-sin (not shown) from a drive shaft 19-and this burningthrough of'thefuel-bedand the in manner well understood to deliver the 7formation 'ofavmass of unbroken coke by fu'el'into'the respectiveretorts providing means forbreaking up said mass" ()verthe' bottom 20 ofthevarious retorts is in the various retorts thereby avoidinr thedesigned to reciprocate a plurality of memforma-tion'of holes in said,and a ord-' hers which may servealsoas sets of second i inguniformityof'the samethrough-the free ary or pusher rams .21 to advance the; fuelpenetration by and uniform distribution of through the respectiveretorts; andin-accordthe air supplied, resulting iii-greater rates ancewith the invention,v these members are offand. more complete combustion;designed to have in addition to the reciprof- The nature of the;invention, however, will catory motion an oscillating motion insa ver'35 best be understood when described in com I tical plane, the lattermotion being provided 5 nection with the accompanying drawings, inforthe purpose of breaking upthecoal in'a I v which-- v V retortandeflecting thereby a more eflicient Fig. 1 isa' fragmentarylongitudina l seccombustion ofthe same; Secondary" riams tional Viewthrough a furnace'provided with have heretofore been utilized foradvancing 4o anunderfeed stoker of the inclined multiple the fuelthrougha-retort and havebeeniaietu- 9.0v v

retort" type. i e g f f C v ated-from'the movement ofthe primary ram;Fig, 2 is a fragmentary transverse :secv and'incarryi-ng out the presentiILVGIItilODyiJhB tional :view on an. enlarged scale,ltalien on saidsecondary rams may be similarly aetuf the line 2 -2, Fig. l, and lookingin the di ated from the primary ram 1-8. 4'5 reotion'ofthearrows i V vFig. Sis transverse, fragmentaryhori-' however, are arranged to behingedly con? zontal sectional View on an enlarged scale, nected toasliding member as, foraexample, a 7 taken on the line 3.-3; Fig, 1.,and looking in plate 22 whichis designedto reciprocate ever thedirection of the arrows, i theretortbottom 20 and cover a longitudinal TThe said members or-seconda-ry rams 21-, v

50 Fig. 4 illustratesa modificatioml'bei-ngadeg opening 23 provided.thereinfl-to admit of the m9 said plate as an integral part thereof.Said passage downwardly through said botton'iot a bearin'g arm 24 whichis fixedly secured to opening accommodates also the oscillatory movementofa secondary ram member, the bottom edge of which extends normallybelownot only the surface of its surrounding carryingplate but also beneaththe bottom 20 of theretort, it being noted that, the said platewillassist, also, in advancing the fuel. The vreciprocatory motlon for thesecondary rams is, as hereinbefore stated,'to be de- 18, for example,through a drive arm '25 ex means'forvaryingthe extent ofreciprocation ofthe drive rod 26 and, correspondingly, the

rived from the movement of the primary'ram tending downwardlytherefromand arranged to be adjustably connected to a drive-rod 26 which'ismounted for reciprocation in the" furnace wall 27 .1 A lost motiondevice, comprising apin28 adapted to be fitted invarious openings 29 atthe forked end of the rod 26 and into whichfits the arm 25, providesextent ofreciprocation ofthe s-eoondaryrams.

the aforesaiddevice, is provided .at the oppo site end of drive rod 26,or at various points alongsame when more than twosets oilseeondary ramsareutilized, so that the extent arcuatefront walli' I inbefo re setforth, provision is made to suit- A further lost motion 'devi'ce 30,similar to of reciprocationof a succeeding secondary ram myWbe-madelessthan that of the preced-j ing ram.

The secondary ram 21 maybe of-various forms and, as indicated-in Figsl,2: and 5 ofthe'drawings, consists -of a flat-top,boX-.

like member of triangular cross sectionwith In order to effect thissecondary ram'relatively to its carrying plate 22, which latterv isdesigned to be reciprocatedalong the bottom of a retort as hereablyconnect the same with the-reciprocating drive rod 26. To this end, asecondary ram is provided with a downwardly extending arm which maybeintegral-therewith, as

shown'in Figs. '1, 2'and 5 and is connected I by means of alink41 withthe one end of a lever 42 pivoted intermediate its ends to the arm 24extendingdownwardly from plate 22. The opposite orflower end of saidlever42 'is pivotally attached to the drive -ro d 26 and thusimparts'the motion of said rod to the arni" 40 to effect a consequentoscillation of said secondary ram member 21 in accordance with thereciprocation of rod 26; 'This oscile lation is limited by a lost motionconnection 'onthelink 41 'as' through a pin or stop 43 designed toengage one side of the arm 24and a stop 44 carried by the link 41 attheopposite side ofsaid arm, the link being provided with I a number ofopenings 45'forreceiving the' said stop members which are thusadjustable along said'linli to provide forrlost motion. As the rod 26 1smoved toward therear of the fur? oscillation of the retort, I v I r 3.In-anunderfeed stoker of the inclined nace, it first causes the lever 42to'rotate the secondary ram 21 downwardly until the pin or stop 43engages arm 24 when said lever is.

held tothe arm, and the plate 22 will then be moved to the rear of thefurnace. When the rod 26 is moved in the opposite direction, the V ramis raised :until the other pin 44 engages with the arm 24 as the lever42 is againimoved and the plate 22 moves then in the opposite directionor backwardly. The extent of oscillation of aflse'condary ram'isadjustable and fixed by the positioning of thestops 43 and v 44 onthelink 41.

V i I have foundit desirable, also, to duplicate the secondary rams foreach set, as indicated v in Fig. 1, which is accomplished by means of aconnecting link member 46 extending downwardly below the retort bottom20 from the one ram'and connecting the same withthe other. r

, Furthermore, in order to seal the contacts between the front andsidewalls ofa second ary ram member andthe surrounding portions-of theplatewhich carries the same,

there is provided a spring steel lining sheet i 50, Fig, 4, whichispreferably corrugated horizontally as shown and secured over the, 2

corresponding plateedges along the front and sidesoi? the opening 2'3 asby means of rivets 51. This will provide an efiective closure andsealagainstsifting ofthe coal into the wind-box but will still allow theoscillation of a secondary ram 'relatively to the A V r f r 1. 'In anunderfeed stoker' ofthe' inclined plate and eliminate binding I claimz''m' multiple retort type: the-combination with elements reciprocable andoscillatable in the respective retorts,,ai 1'd means to reciprocate thesame; of means toelevate simultaneously 1 all the 'reciprocable andoscillatable elements of aretort andalso to'depress simultaneously allof said-elements. 1*: r 2. In'anfunderfeedjstoker of the inclinedmultiple retort type: the cornbination" with elementsreciproca-ble andoscillatable the respective retorts, and means to reciprocate the same;of vmeans to maintain elevateda Y said reciproc-ableand oscillatableelement substantially :duri'ngitsstroke up its inclined multiple retorttype E the combination with elements reciprocableaandioscillatable inthe respective retort's,and means to reciprocate the same; of means tomaintain "depressedla stantially during its stroke downits inclinedretort. r

'saidreciprocableandioscillatable element sub- T 5. In an underfeedstoker'of the inclined- .multiple retort type including a reciprocableprimary ram for introducing fuel to the furnace, and means toreciprocate said ram :s'econdary rams, a member slidable over a retortbottom and to which a secondary ram is pivotally attached, said memberhaving an arm extending downwardly through a slot in the retort bottom,an arm rigidly attached to said secondary ram, a. lever fulcrumed to thearm of the slidable member, a link secured toone end of the lever and tothe arm of said secondaryram, and reciprocating mechanism pivotallyconnected to the opposite end of said lever for reciprocating theslidable member and attached secondary ram. c

6. In an underfeed stoker of the inclined multiple retort typeincluding'a reciprocable primary ram for introducing fuel to the'furnac-e, and means to reciprocate said ram sec-- ondary rams, a memberslidable over a retort bottom and to which a secondary ram is pivotallyattached, said member having an arm extending downwardly through a slotin the retort bottom, an arm rigidly attached to said secondary ram, alever fulcrumed to the arm of the slidable member, a link se-' cured toone end of the lever. and to the arm of said secondary ram and connectedwith the slidable member arm, and reciprocating mechanism pivotallyconnected to the opposite end of said lever for reciprocating theslidable member and attached secondary ram.

7 In an underfeed stoker of the inclined multiple retort type includinga reciprocable primary ram for introducing fuel to the furnace, andmeans to reciprocate said ram: secondary rams, a member-slidable over aretort bottom and to which a secondary ram is pivotally attached, saidmemberhaving an' arm extending downwardly through a slot in the retortbottom, an arm rigidly attached to said secondary ram, a lever fulcrumedto the arm of the slidable member, a link ad justably secured'to one endof the lever and V to the arm of said secondary ram, and reciprocatingmechanism pivotally connected to the opposite end ofsaid lever forreciprocating the slidable member and attached secondary ram. i e V 8.In an underfeed stoker of the inclined multiple retort type including areciprocable primary ram for introducing fuel to the furnace, and meansto reciprocate said ram: secondary rams comprising hollow box-likemembers of triangular shape open-under neath, a plate slidable over aretort bottom and to which a secondary ram is pivotally at tached, saidplate having an'arm extending downwardly through a slot in the retortbotsaid lever, and reciprocating mechanism pivotally connected.totheother end oii-said lever tom; an armrigidly"attachedftoisaidi'second ary ram; a; lever fiulcrunlediito the; arm ofthe; 7 plate; link adjustably connecting the two: said arms 'andlconnected: to one end} of tor reciprocating the slidable plate andilattached secondary' ram.

' 9L In an underfeed furnace, and means to: reciprocate: said mama;

secondary rains; comprising hollowbox-like members of triangular shapeopen. underneath, a plate slidable-"over a; reto:rt;botto1nstokeniotlthe inclined V multiple retortl type:including"aireciproca- Iv 'bleprimary ram for 'int'roducingfuel to; the

and t'owhich asecondaryram i's pi'votally'attached, said plate havingarm. extending downwardly through a slot inithezretortbotany" ram, alever fulcrumedf toathe arnr :ofst-he tom, an arm rigidly attached to'Sfiidl second- 7 plate,aj linli adjustably connecting theytwo said armsand connected' sto one end of lever, and: reciprocatingmechanismr-pivotala and adjustably connected to the-other end ramandoscillatable in the retorts,.and means,

members reclprocato impart to succeeding tions of different extent. I pv 11. In an underfeed stoker of'the inclined multiple retort type: thecombination with elements reciprocable and oscillatablein the respectiveretorts, and 'means'to reciprocatev the same; ofmea-ns to maintainelevated a said reciprocable and-oscillatable element a substantiallyduring its stroke up its inclined retort, and means to adjust the extentof oscillation of an element.

12. In an underfeed stoker of the inclined multiple retort typeincluding a reciprocable' primary ram for introducing fuel tothefurnace, and means to reciprocate said ram: a.

platecslidable over a retort bottomand pro-F vided with an opening, amember hingedly secured to the plate to oscillate through said opening,and meanstoseal the said joscillatable member with respect" tothe'opening.

18. In an underfeed stolrer'of the inclined multiple retort typeincluding a reciprocable primary ram for introducing fuel to thefurnace,'and means to reciprocate said ram: a

plate slidable over a-retort bottom and pro- I vided with arectangular'opening, amember hinged to the plate at one sideof theopening member secured to the plate over the remain- V 3 ing three sidesof theopening to seal said oscillatable member with respect thereto.

multiple retort type including a reciprocable,

14. In an underfeed stoker. of the inclined.

to oscillatetherethrough, and a flexible lining 112 f it 7 primary ramfor introducing fuel to the fur- 1 nace, and meansato;reciprocate" saidramza V plate slidablebveraretort bottom and pro vided' with arectangular opening, a member hinged tothe plate at one. sideof theopen'ing to'oscillate' therethrough, a flexible lining member secured to'the plate over the re.-

maining'three sides of the'o'pening to seal 7 said oscillatable' memberWithrespect there- 7 'to,-said-p1ate having an arm extendingdown- IWardly through a slot in the retort bottom;

:an. arm rigidly attached to the member 7 hingedlyfsecured to the plate,a lever fulcrumed to the arm of the;plate, a link secured Vtoone'endofthe lever'and'to the armof the "hingedly 'securedmember, andreciprocating "mechanism pivotally connected'to the'other end'of thelever. 15; In an inclined stoker-retort: a recip- .rocab1e roustingmemberf therein, and means to reciprocate said-v member and to elevateit viat the beginning of its stroke up its retort andto maintain it inthe, elevated position substantially to the end of the stroke, saidmeans being adapted-also to depress-the rousting member and to maintainitin the depressed position substantiallyto the 7 end of itsstroke down.theretort. is

o o JGEORGEC. COOK,

In testimony whereofl aflixmysignature;

